基于图像处理的小通道内气液两相流含气率的实验研究  

Experimental Study of the Gas-liquid Two-phase Flow Gas Content in a Small Channel Based on Image Processing

作　　者：周云龙[1] 王红波[1] 顾杨杨[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《热能动力工程》2012年第1期38-42,133,共5页Journal of Engineering for Thermal Energy and Power

基　　金：吉林省科技发展项目基金资助(20060704)

摘　　要：采用高速摄像机对水力直径为1.15 mm的正三角形小通道内气液两相流流型进行实时拍摄和图像采集,提出一种利用数字图像处理技术检测小通道内气液两相弹状流体积含气率的方法。针对小通道内两相流型中气泡间相互无遮掩的优势,利用图像处理技术对各流型图像进行消噪、边缘提取、二值化、区域标记和填充等处理,根据提出的三维气相体积计算模型得到体积含气率。最后与漂移流模型计算结果进行比较,比较和实验结果都表明:对于弹状流,该方法得到的含气率与真实值的误差在±15%以内,具有较高的测量精度;并对实验数据进行回归分析得到了截面含气率公式,可用于微小通道内气液两相流参数的在线检测,为今后微小通道内的两相流动特性研究提供参考。By using a high speed video camera,real-time photographed and image acquired were the flow patterns of a gas-liquid two-phase flow in a small regular triangular channel with a hydraulic radius of 1.15 mm.On this basis,a method for inspecting and measuring gas-liquid two-phase slug flow volumetric gas content in a small channel by utilizing digital image processing technology was proposed.By utilizing the advantage that the bubbles in two-phase flow in small channels are not covered with each other and such processing methods as noise elimination,edge detection,binarization,zone marking and filling etc.,the volumetric gas content was obtained based on the three-dimensional gas phase volume calculation model.Finally,a comparison was made with the results calculated by using the drifting flow model.Both the comparison and the test results show that for a slug flow,the method in question has a relatively high measurement precision with the error between the gas content obtained by using the method and the practical value being in a range of ±15% and a gas content formula in a section being obtained by regression analyzing the test data.The above-mentioned method can be used for on-line testing the parameters of a gas-liquid two-phase flow in small channels,thus,offering reference for studying two-phase flow characteristics in small channels.

关 键 词：气液两相流 小通道 体积含气率 图像处理 漂移流模型 

分 类 号：O359.1[理学—流体力学]